You do not need to disconnect the series connections to do this as long as you can access just the lowest battery. Batteries may be wired in parallel or in series.
Simple 12 Volt Charger Circuit
How to charge 2 12v batteries in series. Charge all the batteries at the same time. To charge two 12 volt batteries in series youd need a 24 volt charger. Voltage if there is one. Charging 12 volt batteries wired in parallel requires a 12 volt battery charger. As the batteries charge their voltages rise again and this time the smaller battery charges faster. Charging only some of the batteries will result in batteries attempting to equal out the power and charging each other.
In the examples below two 6v batteries in series 12v. In the second example to charge a 24v system simply use each bank of the charger on each 12v battery terminal leads. For a plethora of information. So connecting two 12 volt batteries in series makes the output of the two 12 volt batteries to become 24 volts and would require 24 volts to charge efficiently and effectively. The series connection of two identical batteries allows to get twice the rated voltage of the individual batteries keeping the same capacity. One basic configuration for charging batteries in series is to connect the positive charger output in red to the positive end of one of the batteries.
Two 12 volt batteries wired in series produce 24 volts but the capacity remains the same as one for a 12 volt battery. Thats the pat answer. The easiest way to fix a voltage difference is to charge the pack fully then bring up the lowest battery with a 12v charger placed on just the lowest battery. This requires only one bank of a 12v charger to be attached to the positive terminal of the first battery and the negative terminal of the second battery. Charge more than five batteries by connecting one 12 volt battery charger across each battery in the series as if each battery were the only one being charged. Following this example where there are two 12v 200ah batteries connected in series we will have a total voltage of 24v volts and an unchanged capacity of 200ah ampere hour.
Assuming nothing has exploded but the 12 volt battery eventually dropped in voltage to a point where the device cut off the supply you are left with a fairly flat 12 volt battery and a very flat 6 volt battery. When batteries are connected together in series the volts of the batteries becomes the addition of all the batteries while the amperage remains constant. Two 12 volt batteries wired in parallel continue to produce 12 volts but the capacity doubles. You need to overcome the total voltage of the series batteries 12 v 12 v 24 v to drive electrons. Then connect the negative end of the battery to the positive end of the next one and continue to do so for the rest of your batteries. Next time you charge you should see the batteries are then closer in voltage at the end of the charge cycle.
Gallery of How To Charge 2 12v Batteries In Series
